Concept:Plural nouns refer to more than one person, animal, or thing. Some words change completely to show plurality.
Explanation:The word 'Mice' is the irregular plural form of 'Mouse'. For example: "Mice have nibbled all the cheese away."
Note: Because 'Mice' is plural, we use a plural verb like 'have', not 'has'.
The other options are all singular: 'Dog', 'Fox', and 'Goat' refer to only one animal each.
Therefore, only 'Mice' is a plural word among the given choices.
Answer:Option D (Mice)